More than any other group surveyed, Republicans are most concerned about voter fraud as a major issue in the November general election, according to the results of the latest Gallup poll released Monday.

Overall, slightly more than one in three (36 percent) of the adults surveyed said they saw it as a major problem, while 32 percent said they viewed the prospect of eligible voters not being able to vote as a significant issue. Along partisan lines, 52 percent of Republicans said they are concerned about votes being cast by people who are not eligible vote, compared with 33 percent of independents and 26 percent of Democrats. The issue does not have a significant difference among whites, of which 37 percent called it a "major" issue, and 35 percent of non-whites who said the same. More than four in 10 in the South (42 percent) suggested they see voter fraud as a major issue, while about one in three in the East, Midwest and West said they saw it the same way.

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Republican nominee Donald Trump and running mate Mike Pence have both urged their supporters to be vigilant for signs of fraud at the polls, warning that the election could be "rigged" against them.

Democrats, meanwhile, are 18 points more concerned than Republicans about eligible voters not being able to cast their ballots (40 percent to 22 percent). Nearly half — 46 percent — of nonwhites said they are concerned about it as a major issue, while a smaller share of whites — 25 percent — said the same.

With roughly equal measure, large majorities of Americans support both requiring voters to present photo identification at the polls as well as early voting. The poll also found 63 percent in favor of automatic voter registration, with 34 percent opposed.

Eighty percent said they support voter ID, while 19 percent said they generally oppose the measure. Among Republicans, 95 percent support voter ID, compared to 83 percent of independents and a smaller share of 63 percent of Democrats.

On a regional basis, support for voter ID was strongest in the East and West, with 69 percent and 66 percent, respectively, favoring it, along with 60 percent of those in South and 56 percent in the Midwest. As far as early voting, support is strongest in the South and Midwest, at 84 percent in both regions.

As far as early voting, 80 percent overall said they back the practice, but with differences between Republicans and Democrats. Among Democrats, 85 percent voiced support, while 74 percent of Republicans did the same, along with 80 percent of independents.

Gallup conducted the poll from Aug. 15-16, surveying a random sample of 1,013 adults nationwide, with an overall margin of error of plus or minus 4 percentage points.